Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, they act as a global thermostat that thus keeps Earth either from burning up or freezing over, even though it also accelerates the destruction of the ozone layer by reacting with chlorofluorocarbons (CFC's).
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Deprofundis 2014-07-02 16:00:51
even though与although重复 虽然它benefit......虽然它accelerates.....
